1280479398 has 64 divisors (see below), whose sum is σ = 2911507200. Its totient is φ = 371871360.

The previous prime is 1280479381. The next prime is 1280479463. The reversal of 1280479398 is 8939740821.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280479398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263640 + ... + 268452.

It is an arithmetic number, because the mean of its divisors is an integer number (45492300).

Almost surely, 2^1280479398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280479398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455753600).

1280479398 is an abundant number, since it is smaller than the sum of its proper divisors (1631027802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1280479398 is a wasteful number, since it uses less digits than its factorization.

1280479398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 1280479398 is about 35783.7868035232. The cubic root of 1280479398 is about 1085.9025803831.

The spelling of 1280479398 in words is "one billion, two hundred eighty million, four hundred seventy-nine thousand, three hundred ninety-eight".